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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/, Aftershock asymmetry on a bimaterial interface
 

Summary: JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/,
Aftershock asymmetry on a bimaterial interface
Allan M. Rubin
Department of Geosciences, Princeton University, Princeton, New Jersey,
USA
Jean-Paul Ampuero
Institute of Geophysics, ETH Zurich, Switzerland
A. M. Rubin, Department of Geosciences, Princeton University, Princeton, NJ 08544, (email:
arubin@princeton.edu)
J.-P. Ampuero, Institute of Geophysics, Seismology and Geodynamics ETH Honggerberg
(HPP) CH-8093 Zurich Switzerland
D R A F T November 7, 2006, 3:06pm D R A F T
X - 2 RUBIN AND AMPUERO: BIMATERIAL RUPTURES THAT STOP
Abstract. To better understand the asymmetric distribution of microearthquake
aftershocks along the central San Andreas fault, we study dynamic models
of slip-weakening ruptures on an interface separating differing elastic half-
spaces. Sub-shear ruptures grow as slightly asymmetric bilateral cracks, with
larger propagation velocities, slip velocities, and normal stress changes at the
rupture front moving in the direction of slip of the medium with the lower
shear wave speed (the southeast front, in the context of the San Andreas).

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences